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Earnings Per Share Net Income for Earnings Per Share Calculations - Basic and Diluted (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Earnings Per Share [Abstract] |  |  |  |  |
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | $ 483 | $ (184) | $ 375 | $ 299 | $ (63)
Net Income Attributable to Noncontrolling Interest | 13 |  | 5 | 21 | 18
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic and Diluted | 470 |  | 370 | 278 | (81)
Income from discontinued operations after income taxes | (1,077) |  | 323 | (717) | 674
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest | 1 |  | (1) | 5 | 6
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic | (1,078) |  | 324 | (722) | 668
Net Income (Loss) Available to Common Stockholders, Basic and Diluted | $ (608) |  | $ 694 | $ (444) | $ 587

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